Table 1 Properties of the Krio EQ-5D-3L assessed, statistics used, pre-specified values and data timepoint used

Construct validity

 Feasibility

Completion rate

% missing item data

< 5% [27]

Seven days, 90 days, one year

 Floor effects

 Ceiling effects

% of patients with the lowest possible score or highest possible score

significant if ≥ 15%, moderate if 10% to < 15%, minor if 5% to < 10%, and negligible if < 5%

Seven days

 Internal consistency

Inter item correlation

0.15–0.75: suitable [28]

Seven days, 90 days and one year

Cronbach’s alpha

0.6–0.7: acceptable

0.8–0.9: good [29]

Seven days, 90 days and one year

Repeatability

 Repeatability

 Test–retest

Weighted Kappa

very poor =  < 0.20: Poor = 0.20 -0.39; moderate = 0.40–0.59; Good: 0.60—0.79, excellent = : 0.80 – 1.0

90 days compared to one year

Known Group Validity

 Known group validity for stroke severity

Kruskal Wallis

p < 0.05

Seven days, 90 days, one year

Convergent Validity

 Convergent validity with BI

Spearman’s correlation coefficient

moderate > 0.4, > 0.5 strong

Seven days, 90 days, one year

Spearman’s rho

0.20 and 0.35 were considered weak, between 0.35 and 0.50 moderate and > 0.50 strong [30]

90 days

Responsiveness

 Responsiveness

 MCID BI > 9.25 points

Cohen’s (D) Effect sizes

< 0.20 trivial, small 0.20–0.50, moderate 0.50–0.80 or large > 0.80

Seven days and 90 days